Because the initial from the zodiac signs, Aries’ have a sense of self-importance, usually seeing themselves as 1st.
This can relate to any walk of life, from becoming the leader from the pack to getting the initial 1 to obtain items moving. These with all the Aries sign are proactive but don’t often see their endeavors via to completion; they’re proud initiators but not necessarily closers, often not completing projects they’ve begun.